Banned Books Week (BBW) is an annual event celebrating the freedom to read and the importance of the First Amendment. Held during the last week of September, Banned Books Week highlights the benefits of free and open access to information while drawing attention to the harms of censorship by spotlighting actual or attempted banning of books across the United States. {Copied from the American Library Association website}
The library has a display of a few of the books that have been banned or challenged over the years.
The ALA has compiled a list on their website, just copy and paste to view the list: http://www.ala.org/ala/issuesadvocacy/banned/frequentlychallenged/challengedclassics/index.cfm